The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon RF 75-300mm f4.0-5.6 and the Samyang 300mm f6.3 for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Canon RF 75-300mm f4.0-5.6 is the longer of the two lenses at 146mm. The Samyang 300mm f6.3 with a length of 74mm, is 72mm shorter. Besides being longer, the Canon RF 75-300mm f4.0-5.6 also has a larger diameter of 71mm compared to the Samyang 300mm f6.3's 65mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Samyang 300mm f6.3 weighs 260g, 48% (247g) lighter than the Canon RF 75-300mm f4.0-5.6's weight of 507g.
Filter Threads
The Canon RF 75-300mm f4.0-5.6 has a filter size of 58mm whereas the Samyang 300mm f6.3 has a 26mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 58mm filters that we recommend you to consider for the Canon RF 75-300mm f4.0-5.6:
And these are the 26mm filters that we recommend for the Samyang 300mm f6.3:
Lens Mounts
The Canon RF 75-300mm f4.0-5.6 has the Canon RF lens mount whereas the Samyang 300mm f6.3 has the Sony Alpha lens mount. Some of the latest released cameras that are compatible with these mounts are Canon R6 V, Canon R6 III and Canon C50 for the Canon RF Mount and Sony A68, Sony A77 II and Sony A58 for the Sony Alpha Mount.
Samyang 300mm f6.3 is also available in Canon EF , Nikon F (DX) and Four Thirds mounts.
Focal Range
Canon RF 75-300mm f4.0-5.6 has a focal range of 75-300mm and
4.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
120 - 480mm.
On the other hand, the Samyang 300mm f6.3 is a prime lens with fixed focal lenght of 300mm which has an effective (full-frame 35mm equivalent) focal range of 450mm when used on a APS-C / DX format camera.
